<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	${desc}
	<p>${user}</p>
	<p>${user!'user not exist'} </p>
	<p>${user.age!'user has no age'}! </p>
	<p>${user?if_exists}</p>
	<p>${user?default('user not exist')}</p>
</body>
</html>

